I may be tired or dumb, but your argument sounds circular to me. Of course the ECB won't insist there is no inflation if they themselves have defined housing to not be included in the definition they use to measure inflation. This doesn't mean that the parent commentator is wrong nor does it imply that ECB is correct in their definition. For most people, housing is a significant cost in day to day life, and will of course be felt as inflation, regardless of how it's defined and measured in monetary policy.

If it were up to me, housing should also be included in the definition of inflation. That would be a good way to lay bare the downsides with an aggressively expanding monetary policy.